Optimal velocity distributions in the design of supercavitating hydrofoils

In the paper, the proofs of theorems formulated in the work by S.E. Gazizova, D.V. Maklakov (LJM, 42 (8), 2021) are sketched out. The theorems serve as a basis for designing supercavitating hydrofoils that have a minimum drag coefficient for a given lift coefficient. Thus, the maximum lift-to-drag ratio is achieved.